I get 1440X900, I didn't install any kexts for video,
I believe EDP 3 sets it up.
For EDP 3 I followed the EDP instructions
in this forum under E.D.P - Releases - EDP 3.0 Released
First run Myhack and pick "Install Myhack Utilities"
Then extract EDP files to the Extra folder,
(I used the manual method)
then run ./edptool.command